<!DOCTYPE html>
<html>
<title>title</title>
<body>
<iframe id="frame1" name="frame1" src="subframe-a.html"></iframe>
<iframe id="frame2" name="frame2" src="subframe-b.html"></iframe>
<iframe id="frame3" name="frame3" src="subframe-c.html"></iframe>
</body>
</html>
